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Completion of BSCA/SDLC Installation
It is the customer's responsibility to have the
communications line cable connected to the
common-carrier facility. Make the connection
at this time. Refer to Section 10.5.0 of this
MLM for leased line and switched line connections.
2400 bps Integrated Modem
o
6. For leased or multipoint line modems,
perform the following transmit/receive
checkout.
a. Disconnect the 283-B plug on the end of
the exit cable from the communication
line. See Section 10.5.0 for location.
b. To strap a two-wire leased modem
for four-wire operation, attach or
remove the following jumpers:
If SNBU is not installed, add jumper B
on card B-A 1 Q2 (see Section 10.4.5).
Remove jumpers F (two locations) and
add jumpers G (two locations) (see
Sectionl0.4.5).
Remove jumper K and add jumper
J
on card B-A1K2 (see Section 10.4.7).
Add jumper B on card B-A 1 M2 (if
installed) '(see Section 10.4.8).
c. Set the test/operate switch to T3 (on the
2400 modem operator panel).
d. At the 283-B plug, short the transmit
pins to the receive pins:
- Connect a jumper from the red wire
pin to the yellow wire pin.
Connect a jumper from the white wire
pin to the black wire pin. (See Section
10.5.0 for plug description.)
e. Check for the following modem opera-
tion indicators:
- Operate light is on continuously
- Signal light is on continuously
-
Ready light is off.
- Signal meter reads less than 50. (Zero
is not a bad reading.)
f. Set the test/operate switch to T 4 and
check for the modem operation indicators
listed in step e.
g. Remove the jumpers at the 283-B plug.
h. Restore all card jumpers to their original
positions.
j. Set the test/operate switch to operate.
k. Connect the 283-B plug to the commun-
ication line.
I.
If all modem operation indicators listed in
step e were not present in T3 and T4
switch positions, perform the diagnostics.
(See MAP Sections 3100 or 3200.)
o
7. For leased line installation, perform the
equalization procedure. This is a customer
responsibility after installation, and should
be done at this time by the customer engi-
neer with the customer observing the
procedure.
a.
Point
to
point:
Set the local test/operate
switch on T3 and the remote modem
switch on T 4. Have the remote modem
receive equalizer adjusted for a minimum
reading on the remote modem signal
quality meter.
e-6
TNL: SN31-0487 to SY31-0373-4 (25 Nov 77)
Set the local test/operate switch on T 4
and the remote modem switch on T3.
Adjust the local modem receive equalizer
for a minimum reading on the local
modem signal quality meter. Leave
equalizer set at minimum reading and
return the test/operate switches to
OPERATE.
b.
Multipoint:
Set the local test/operate
switch on T3 and the remote modem
switch on T4. Adjust the local modem
transmit equalizer for a minimum reading
on the remote modem signal quality meter.
Set the local modem test/operate switch
to T4 and the remote switch to T3. Adjust
the local receive equalizer for a minimum
reading. Leave the equalizers set at the
minimum reading and return the test/
operate switches to OPERATE.
o
8. Run the BSCA/SDLC online test. Refer tc
the
Diagnostic Service Guide
(P/N 2547690)
online test section. For a leased line con-
nection, the remote system must have
online test capability.
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